Bicycle frame



FIG. 1 is a perspective view of a bicycle frame, showing our new design;

FIG. 2 is a right-side elevation view thereof;

FIG. 3 is a left-side elevation view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is s rear elevation view thereof; and,

FIG. 6 is a top plan view thereof.

The broken lines shown in the drawings illustrate portions of the bicycle frame that form no part of the claimed design. 

CLAIM We claim, the ornamental design for a bicycle frame, as shown and described. 